= pyrotechnic, adj. 2. Obsolete.

Of or relating to the use of fire in chemistry, metallurgy, etc. Obsolete. Cf. pyrotechny, n. 2.

Of or relating to siderurgy.

= metallographic, adj. 3.

Of, relating to, or involving pyrometallurgy.

Of or relating to the science of metallography (metallography, n. 3). Cf. slightly earlier metallographical, adj.

of, relating to, or concerned with the process of powder metallurgy.